home
Menu
Create
Random
0
0
0

AQA - A Level Physics - Electricity #2

Recap
Quiz by Nighthawk
Rate:
Last updated: July 8, 2020
You have not attempted this quiz yet.
More quiz info >>
First submittedJuly 8, 2020
Times taken0
Report this quizReport
Quiz and answer stats >>
Friends stats >>
4:00
Enter answer here
0
 / 13 guessed
The quiz is paused. You have remaining.
Scoring
You scored / = %
This beats or equals % of test takers also scored 100%
The average score is
Your high score is
Your fastest time is
Keep scrolling down for answers and more stats ...
Hint
Answer
Define Resistivity
A measure of a material's opposition to current (=RA/L)
Equation for resistivity
rho = RA / L
What are the units of resistivity
Ωm
Define a superconductor
A material with a resistivity of zero below a critical temperature
What is meant by the critical temperature?
The temperature below which a material becomes a superconductor.
Give a use of a superconductor
MRI scanners, particle accelerators, maglev trains.
Describe an electrical conductor
A material containing free charge carriers
Hint
Answer
Describe an electrical insulator
A material with no free electrons/charge carriers
What is meant by a charge carrier
A particle that can move in a material and transfer energy (e.g. electrons in metals, ions)
Describe a Metallic Conductor
A material containing delocalised electrons that can carry electrical current
Describe a Semiconductor
A material where the number of free charge carriers varies (e.g. with temperature)
Why does resistance increase with temperature
Lattice ion vibrations increase causing more frequent collisions between electrons and lattice ions.
Why does current lead to heating in resistors
Electrons collide with the lattice ions and transfer some of their kinetic energy to the ion's vibrations.
No comments yet
Save Your Progress

Copyright H Brothers Inc, 2008–2024

Contact Us | Go To Top | View Mobile Site